I'm in my 60s, retired from a career in government. Apple is by far my largest investment comprising over 80% of my portfolio. I also have a large position in Ford. I lost over half my portfolio in the 2008/9 market crash so I sold most of what was left and put the vast majority of my money in Apple at $94 a share. It subsequently dropped to below $80 but then began it's upward climb and as of Feb 2012 it put me in extremely good shape. I tend to buy stocks for the long run and trade very infrequently. I research companies extensively before I buy, the reason I went nearly all in when I purchased Apple was that my research gave me confidence was that Apple would eventually get me back in the black. I felt the same, though to a lesser extent, with Ford.